DF2398F20V Renesas Electronics America, DF2398F20V Datasheet - Page 176

• Manufacturer Part Number: DF2398F20V
• Description: IC H8S/2300 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2398F20V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 87
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• For Use With: YR0K42378FC000BA - KIT EVAL FOR H8S/2378
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Rev.6.00 Oct.28.2004 page 146 of 1016
REJ09B0138-0600H
RAS up mode
To select RAS up mode, clear the RCDM bit in MCR to 0. Each time access to DRAM space is interrupted and
another space is accessed, the RAS signal goes high again. Burst operation is only performed if DRAM space is
continuous. Figure 6-22 shows an example of the timing in RAS up mode.
In the case of burst ROM space access, the RAS signal is not restored to the high level.
CAS, LCAS
Note: n = 2 to 5
CSn, (RAS)
D
A
15
23
to D
to A
ø
0
0
Figure 6-22 Example of Operation Timing in RAS Up Mode
T
p
DRAM access
T
r
T
c1
T
c2
DRAM access
T
c1
T
c2
External space
T
1
access
T
2